diff options
| -rw-r--r-- | drivers/acpi/dispatcher/dsobject.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/drivers/acpi/dispatcher/dsobject.c b/drivers/acpi/dispatcher/dsobject.c index 58d4d91c8e9..7562823b3b7 100644 --- a/drivers/acpi/dispatcher/dsobject.c +++ b/drivers/acpi/dispatcher/dsobject.c @@ -373,7 +373,7 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state, union acpi_parse_object *parent; union acpi_operand_object *obj_desc = NULL; acpi_status status = AE_OK; - acpi_native_uint i; + unsigned i; u16 index; u16 reference_count; @@ -476,10 +476,37 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state, arg = arg->common.next; } - if (!arg) { + /* Check for match between num_elements and actual length of package_list */ + + if (arg) { + /* + * num_elements was exhausted, but there are remaining elements in the + * package_list. + * + * Note: technically, this is an error, from ACPI spec: "It is an error + * for NumElements to be less than the number of elements in the + * PackageList". However, for now, we just print an error message and + * no exception is returned. + */ + while (arg) { + + /* Find out how many elements there really are */ + + i++; + arg = arg->common.next; + } + + ACPI_ERROR((AE_INFO, + "Package List length (%X) larger than NumElements count (%X), truncated\n", + i, element_count)); + } else if (i < element_count) { + /* + * Arg list (elements) was exhausted, but we did not reach num_elements count. + * Note: this is not an error, the package is padded out with NULLs. + */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Package List length larger than NumElements count (%X), truncated\n", - element_count)); + "Package List length (%X) smaller than NumElements count (%X), padded with null elements\n", + i, element_count)); } obj_desc->package.flags |= AOPOBJ_DATA_VALID; |